Esta página se tradujo automáticamente y no se garantiza la precisión de la traducción. por favor refiérase a versión inglesa para un texto fuente.

Intervención de Comunicación para Mejorar las Tasas de Vacunación contra la Influenza entre Personas Mayores en Can Tho (CIVECT)

25 de septiembre de 2026 actualizado por: Can Tho University of Medicine and Pharmacy

Efectividad de las Intervenciones de Comunicación Basadas en la Comunidad para Mejorar las Tasas de Vacunación contra la Gripe entre los Ancianos en Vietnam: Un Ensayo Aleatorizado por Grupos Controlado

This study evaluates the effectiveness of a multi-component community-based communication intervention to increase influenza vaccination rates among adults aged above 65 years in Can Tho City, Vietnam. Using a cluster randomised controlled trial design with stratified lottery randomisation, four study sites were selected from eight sites surveyed in a prior study: O Mon Ward and Truong Thanh Commune (intervention); Phuoc Thoi Ward and Truong Xuan Commune (control). The intervention includes community health education sessions, healthcare worker training, household visits, health communication banners, and Zalo-based vaccination reminders, delivered over 12 months (September 2025 to September 2026). Effectiveness is assessed by comparing pre- and post-intervention outcomes using Difference-in-Differences (DID) analysis.

Descripción general del estudio

Estado

Terminado

Condiciones

Intervención / Tratamiento

Descripción detallada

This study employs a cluster randomised controlled trial (cluster RCT) design with a repeated cross-sectional approach. The unit of randomisation is the cluster (ward or commune).

RANDOMISATION:

From eight study sites surveyed in Objective 1 (four urban wards and four rural communes in Can Tho City), four sites were selected by stratified lottery randomisation. Within each stratum (urban and rural), one site was randomly assigned to the intervention group and one to the control group by lottery draw without investigator discretion:

  • Intervention: O Mon Ward (urban) and Truong Thanh Commune (rural)
  • Control: Phuoc Thoi Ward (urban) and Truong Xuan Commune (rural)

PARTICIPANTS:

All eligible permanent residents aged above 65 years at each study site were invited to participate. Data are collected at two independent cross-sectional time points:

  • T0: Baseline survey, August 2025 (n=952)
  • T1: Follow-up survey, September 2026 (n=approximately 1,200) Participants at T0 and T1 are not necessarily the same individuals; the design captures population-level changes within randomised clusters.

INTERVENTION (12 months: September 2025 to September 2026):

The 12-month duration encompasses both active implementation and the time required for knowledge, attitude, and behaviour change.

Phase 1 (September 2025, intensive activities):

  • Two community health education sessions per intervention site for adults aged >65 years and one cohabiting family member, with distribution of printed educational leaflets on influenza disease and vaccination. Attendance: O Mon Ward: Session 1 = 60 older adults + 40 family members, Session 2 = 57 older adults + 35 family members; Truong Thanh Commune: Session 1 = 60 + 38, Session 2 = 50 + 30.
  • One capacity-building workshop per site for healthcare workers and community health volunteers in vaccination counselling (O Mon Ward: n=30; Truong Thanh Commune: n=20).
  • Thirty household visits per site by trained community health volunteers to reinforce vaccination counselling.

Phase 2 (September 2025 to September 2026, ongoing):

  • Health communication banners displayed at health stations and community information centres throughout the intervention period.
  • Healthcare worker vaccination counselling integrated into all routine clinical contacts at intervention site health stations.
  • Zalo-based digital communication: weekly educational content and personalised vaccination reminders (December 2025 to January 2026, coinciding with peak influenza season in southern Vietnam).

CONTROL GROUP:

Received routine primary healthcare only, with no additional study-related activities.

ANALYSIS:

Effectiveness is measured using Difference-in-Differences (DID) regression, comparing changes between T0 and T1 across intervention and control clusters. Models use multivariable logistic regression (binary outcomes) and linear regression (continuous outcomes), adjusted for sociodemographic covariates. Intraclass correlation coefficients (ICC) were estimated for all outcomes and found to be negligible (ICC < 0.01), confirming the appropriateness of individual-level DID analysis.

Tipo de estudio

Intervencionista

Inscripción (Actual)

1237

Fase

  • No aplica

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Ubicaciones de estudio

    • Can Tho City
      • Can Tho, Can Tho City, Vietnam, 900000
        • Can Tho University of Medicine and Pharmacy

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

66 años y mayores (Adulto Mayor)

Acepta Voluntarios Saludables

Sí

Géneros elegibles para el estudio

Todos

Descripción

Inclusion Criteria:

  • Residents living in selected wards/communes in Can Tho City for at least 6 months.
  • Aged above 65 years.
  • Mentally and physically capable of participating in interviews and receiving communication interventions.
  • Agree to participate in the study and provide informed consent.

Exclusion Criteria:

  • Individuals with severe cognitive impairment or dementia.
  • Individuals with contraindications to influenza vaccination.
  • Planning to move out of the study area during the 12-month follow-up period.

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

  • Propósito principal: Prevención
  • Asignación: Aleatorizado
  • Modelo Intervencionista: Asignación paralela
  • Enmascaramiento: Ninguno (etiqueta abierta)

Armas e Intervenciones

Grupo de participantes/brazo
Intervención / Tratamiento
Experimental: Multi-component Health Communication

Adults aged >65 years in 2 intervention clusters (O Mon Ward and Truong Thanh Commune) receive a multi-component package:

Phase 1 (Sep 2025): (1) Two community health education sessions/ site for older adults and one family member, with influenza leaflets. (2) One HCW capacity-building workshop/site (O Mon: n=30; Truong Thanh: n=20). (3) Thirty household visits/site by community health volunteers.

Phase 2 (Sep 2025-Sep 2026): (4) Health communication banners at health stations and community centres. (5) HCW point-of-care vaccination counselling at all clinical contacts. (6) Zalo-based weekly reminders and educational content (Dec 2025-Jan 2026).

A 12-month cluster-level communication intervention (Sep 2025-Sep 2026) delivered in two phases to all adults aged >65 years in intervention clusters:

Phase 1 (Sep 2025): (1) Two community health education sessions/site with influenza leaflets for older adults and family members; (2) HCW capacity-building workshop/site (O Mon: n=30; Truong Thanh: n=20); (3) Thirty household visits/site by community health volunteers.

Phase 2 (ongoing): (4) Health communication banners at health stations and community centres; (5) HCW point-of-care vaccination counselling at all clinical contacts; (6) Zalo-based weekly educational content and vaccination reminders (Dec 2025-Jan 2026).

Sin intervención: Routine Immunization Information

Participants in this arm receive standard care and routine immunization information provided by the local health station without the additional communication package.

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Influenza vaccination uptake in the preceding 12 months
Periodo de tiempo: Up to 12 months

Proportion of participants who received influenza vaccination in the 12 months prior to survey, assessed by self-report. Baseline assessed August 2025; follow-up assessed September 2026. Intervention effect estimated using Difference-in- Differences (DID) regression comparing change between intervention and control clusters.

Up to 12 months

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Influenza vaccination in calendar year 2025
Periodo de tiempo: Up to 12 months

Proportion vaccinated against influenza during calendar year 2025, assessed by self-report at follow-up (September 2026).

Up to 12 months
Influenza vaccination intention
Periodo de tiempo: Baseline and up to 12 months

Proportion intending to receive influenza vaccination in the next 12 months, assessed by self-report at baseline (August 2025) and follow-up (September 2026).

Baseline and up to 12 months
Healthcare worker vaccination counselling
Periodo de tiempo: Baseline and up to 12 months

Proportion who received influenza vaccination counselling from a healthcare worker or community health volunteer in the preceding 12 months, assessed by self-report at baseline (August 2025) and follow-up (September 2026).

Baseline and up to 12 months
Influenza knowledge score
Periodo de tiempo: Baseline and up to 12 months

Total knowledge score (0-6) on influenza disease aetiology, transmission, complications, and vaccine characteristics. Higher scores indicate greater knowledge. Assessed at baseline (August 2025) and follow-up (September 2026). Analysed using linear regression DID.

Baseline and up to 12 months
Vaccine hesitancy score (WHO-SAGE Vaccine Hesitancy Scale)
Periodo de tiempo: Baseline and up to 12 months

Vaccine hesitancy measured using the WHO-SAGE Vaccine Hesitancy Scale (Vietnamese-adapted version). Higher scores indicate greater hesitancy. Assessed at baseline (August 2025) and follow-up (September 2026). Analysed using linear regression DID.

Baseline and up to 12 months
Willingness to pay for influenza vaccination
Periodo de tiempo: Baseline and up to 12 months

Proportion willing to pay out-of-pocket costs for influenza vaccination, assessed by self-report binary question at baseline (August 2025) and follow-up (September 2026).

Baseline and up to 12 months

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

Colaboradores

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Actual)

1 de septiembre de 2025

Finalización primaria (Actual)

9 de septiembre de 2026

Finalización del estudio (Actual)

9 de septiembre de 2026

Fechas de registro del estudio

Enviado por primera vez

27 de marzo de 2026

Primero enviado que cumplió con los criterios de control de calidad

27 de marzo de 2026

Publicado por primera vez (Actual)

2 de abril de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

28 de septiembre de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

25 de septiembre de 2026

Última verificación

1 de septiembre de 2026

Más información

Términos relacionados con este estudio

Otros números de identificación del estudio

  • NIHE IRB - 40/2025

Plan de datos de participantes individuales (IPD)

¿Planea compartir datos de participantes individuales (IPD)?

NO

Descripción del plan IPD

Individual participant data (IPD) will not be shared with other researchers to ensure the privacy and confidentiality of the study participants, in accordance with local ethical guidelines and institutional policies. Only aggregated results will be made available through publications.

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

No

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .